Let’s say you work on a team that runs a web content management system for various different customers. It is hosted at ourcms.com, but each customer’s public content is published on a different domain, which is determined by a setting in the interface, which they can change at will. When a customer is logged into ourcms.com they see links to their public content in various places, and some of the public content has “edit this”-type links back into ourcms.com. All of this runs as a single PSGI application. A not unfamiliar scenario, presumably.

How do you spin up a development server where you can test this?